I don’t know enough about Hinduism to answer this properly, but you may have a point. If my grandmother had remained in India, perhaps I would have been a Hindu. On the other hand, if she’d done so, I suspect I would have wound up with a very different set of genes and life experiences, so while the person typing this might have been my grandmother’s granddaughter, she may well not have been me in any recognizable form.
I’ve been an active Christian for about 30 years now. Who I am is shaped by that faith and the studying I’ve done as part of it. It would take a lot of hard work and study for my knowledge of and experience with Hinduism to approach that which I have of Christianity. Meanwhile, Christianity does a very good job of supplying my spiritual and emotional needs. I’ve even been helped out financially by churches once in a while. What I believe I am obligated to do as a person and what I am obligated not to do have been shaped by Christianity to the point where, while the form it takes may differ from that it takes for others, it fits me perfectly.
Yes, I think there are environmental factors in what religion one chooses and I acknowledge that influence in my choice. Who’s to say that in an alternate universe I’m not defending Islam somewher just as ardently as I defend Christianity here? On the other hand, this is what I am, and it suits me. It need suit no one else except God.